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Immunohistochemistry for IDO in anaplastic large cell lymphoma: Anaplastic large cell lymphoma, ALK-positive (A,B), ×200, A: H&E stain. The tumor showed score 2 for IDO protein (B). Anaplastic large cell lymphoma, ALK-negative (C,D), ×200, C: H&E stain. The tumor showed no reactivity for IDO protein, score 0 (D).
